Improvement in steasvj vacuum-pumps



'H HALL.

Improvement in SteamVacuum-PumpsI` Patented Sep. 24, 1872.

No.13n529.

Hunde I XWMIieme/w,

CHARLES H. HALL, OF NEW YORK, N. Y.

IMPROVEMENT IN STEAM VACUUM-PUMPS.

Specification forming part of Letters Patent No. 3l,5%9, dated September 24, 1872.

CASE O.

To all lwhom it may concern:

Pumping Apparatus, of which the following is a specification: l

The invention relates to that class of pumping apparatus in which the steam is admitted into the same chamber or chambers with the water and presses upon the surface thereof. The working parts are small relatively to the capacity for pumping, and the apparatus constitutes an eflicient pumping means, operating rapidly and reliably. I employ strong chambers, provided with valves for admitting water and holding it against its return, and also with valves for allowing it to be expelled through another pipe to be conducted to an elevated reservoir, or to such other point as may be desired; and the operations of being filled with water and being discharged succeed each other by reason of a change of position of the steam valve or valves, governing the admission of steam from a boiler or steam-generator, which may be situated at a distance. There are two equal chambers in each set of the apparatus, the two lilling and emptying alternately. The chamber which is filling with water should complete its lling before its mate is emptied,

and the change of the steamvalves is effected tion, and Fig. 2 a plan view.

Gis the piston fixed on the valve-stem e, and working tightly or nearly so in a short cylinder, H, which is connected by pipes h1 h2 to the chambers Al A2, respectively. The arrangement represented allows the valves to Work in a horizontal direction, so that gravity is of no eifect. In the position represented the valve c is open, and the steam is admitted into the chamber A1, driving out the water and sinking the water-line. The chamber A2 Yfills rapidly with water and rests in that condition. So soon as the water-level in the chamber A1 is sunk below the upper edge of the discharge-orifice, and the surface is agitated and a portion of the steam discharged, the vacuumwhich obtains therein is instantly communicated through the pipe h1 to the lefthand side of the pist-on G. This piston and its'connections then move immediately to the left, in obedience to the difference in pressure acting on the piston G. The increased current of steam flowing past the valve el also contributes to this result. From both causes the motion ofthe valve-stem e is very prompt,

closing the steam-valve c1` and opening the 4 steam-valve e2. Immediately on this change of condition the same round of operations occurs in the chamber A2, the chamber A1 filling with water and standing ready'to exert a pressure on the piston G to move it in the opposite direction and again change the position of the valves the moment a partial vacuum obtains in the pressure-chamber A2. Each chamber receives the water past the valves o1 o2 and discharges it again past the valve p, as will be obvious. One object of the casing a. around and partially over the waterinduction orifice in the interior of the chambers is to compel the iniiowing water to rise violently in and near the middle of the chamber, so as to be certain to agitate the surface and continue the condensation of the steam, even if the induction ofthe water is slow and if the steam-valves c1 c2 should leak slightly.

I have found by experiment that the loss of steam is slight when worked in this manner in uncoated vessels of metal; but I propose in ordinary practice to coat the interior of each chamber with japan varnish, or with red lead and oil, or with a solution of rubber or the like, to serve as a durable con-conductor of heat. I can make the chambers and the several connections of lead, to pump acids, or -of glass or other material for any special uses requiring such.

What I claim as myinvention is as follows:

A'rnlvfr Grrrcn.

The casing a, arranged, es shown,re1ative1y n testimony whereof I have hereunto set to the Water-induction valve o1 and to the my hand this 18th dey of May, 1872, in the chamber A1 and its connections, so as to cause presence of two subscribing Witnesses. the Water inducted to be directed to the sury O. H. HALL. face and constantly disturb the Water-surface, and cause the continuous condensation of the Witnesses: steam during,` the admission of the Water, as ARNOLD HRMANN, set forth. W. C. DEY. 

